− | The parathyroid glands are multiple (generally four) small glands, approximately 1-2mm in length are located about the cranial trachea. There are two internal glands embedded within the cranial [[Thyroid Gland - Anatomy & Physiology|thyroid glands]], and two external glands along the trachea, close to the caudal deep cervical lymph nodes. | + | The parathyroid glands are multiple (generally four) small glands, approximately 1-2mm in length are located about the cranial trachea. There are two internal glands embedded within the cranial [[Thyroid Gland - Anatomy & Physiology|thyroid glands]], and two external glands along the trachea, close to the caudal deep cervical lymph nodes. The parathyroid glands produce '''parathyroid hormone (PTH)''', which regulates serum [[Calcium|calcium]] and [[Phosphorus|phosphorus]] concentrations. |